// 关系运算符
void main(List<String> args) {
  int a = 5;
  int b = 3;
  print(a == b);
  print(a != b);
  print(a>b);
  print(a<b);
  print(a>=b);
  print(a<=b);

  String stra = "123";
  String strb = "123";
  print(stra == strb);
}